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    SubjectRe: IDE DMA slower in 2.3.99pre3 than in 2.2.14 and in 2.0.36
    On Sun, 26 Mar 2000, Alessandro Suardi wrote:

    > According to both hdparm and 'dd'.
    >
    > Results, in MB/sec, for hdparm:
    >
    > buffer cache reads buffered disk reads
    > 2.2.14 multcount=0 36.26 10.58
    > 2.2.14 multcount=8 36.36 10.27
    >
    > 2.3.99pre3 multcount=0 36.99 8.11
    > 2.3.99pre3 multcount=8 36.89 8.86
    >
    > 2.3.99pre3 idebus=66 37.21 8.13
    > multcount=0
    > 2.3.99pre3 idebus=66 36.78 8.65
    > multcount=8

    Your system can not do "idebus=66".........try "idebus=33" and repeat.
    You have doubled the clocking and the settings of the PIO base that
    DMA/UDMA extentions work off of most likely reduced.

    >
    > More - fishing in my old e-mail I can see that in 2.0.36 I used to
    > be able to run dd if=/dev/hda of=/dev/null bs=4096 count=16384 in
    >
    > 0.04user 1.90system 0:06.42elapsed 30%CPU (0avgtext+0avgdata 0maxresident)k
    > 0inputs+0outputs (81major+11minor)pagefaults 0swaps
    >
    > while 2.3.99-pre3 idebus=66 multcount=8 only gets to
    >
    > 0.02user 2.34system 0:08.91elapsed 26%CPU (0avgtext+0avgdata 0maxresident)k
    > 0inputs+0outputs (105major+13minor)pagefaults 0swaps
    >
    > It seems we're far slower than we used to be... this is a Quantum
    > Fireball SE4.3A, QDI Titanium IB board, TX430 chipset @66Mhz,
    > AMD K6-200 with 64MB 10ns SDRAM.
    >
    >
    > Thanks for any input,
    >
    > --alessandro <asuardi@uninetcom.it> <asuardi@it.oracle.com>
    >
    > Linux 2.2.14/2.3.99-pre3 glibc-2.1.2-11 gcc-2.95.2 binutils-2.9.5.0.31
    >

    Andre Hedrick
    The Linux ATA/IDE guy


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